"Best" RPM range for stock 944NA engine?
02-17-2005, 10:03 AM
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"Best" RPM range for stock 944NA engine?
We have a tracked -87 944NA, and I'm just curious to about the "best" RPM range for this engine and transmission? I know "best" is a very relative term, but obviously I'm looking to get recommendations on rpm range for the best power, as well as a few pointers on gearshift rpms.
I did search a little through the forums, but could not find much.
A little about our car and engine
The engine has about 200.000+ kilometers on the street before we put it to the track. The only modifications we've done to it - is a 4-1 header, 2.5" performance exhaust and a cone K&N filter. The engine feels a bit more snappy than stock, but we never intended to get mucho power from these mods.
The car weighs in at about 1070kg without fuel and driver...lightening of the car have been limited to whatever we could do without spending any money, but not to the extent where we've scraped off the undercoating.
If you are interested, we've got quite a few pictures from the building process.
And also some large (BE WARNED!) movies here:
Reodor Racing @ Zandvoort - 45Mb
Our first on-board taping session... (and I drop all the Oil on the track) - 121Mb!
A couple of laps @ Zandvoort - 70Mb
Best regards,
Ørjan Sandland
Team Manager - Reodor Racing
I did search a little through the forums, but could not find much.
A little about our car and engine
The engine has about 200.000+ kilometers on the street before we put it to the track. The only modifications we've done to it - is a 4-1 header, 2.5" performance exhaust and a cone K&N filter. The engine feels a bit more snappy than stock, but we never intended to get mucho power from these mods.
The car weighs in at about 1070kg without fuel and driver...lightening of the car have been limited to whatever we could do without spending any money, but not to the extent where we've scraped off the undercoating.
If you are interested, we've got quite a few pictures from the building process.
And also some large (BE WARNED!) movies here:
Reodor Racing @ Zandvoort - 45Mb
Our first on-board taping session... (and I drop all the Oil on the track) - 121Mb!
A couple of laps @ Zandvoort - 70Mb
Best regards,
Ørjan Sandland
Team Manager - Reodor Racing
02-17-2005, 04:30 PM
#2
Burning Brakes
personally i am not sure as i do not track my car but it neems to me i get most of my power over 2500 rpm but i could be wrong. Try reposting on the 924/44/68 board under the water cooled topic there is much more topic. THere is much more traffic there and i am sure a few whoe would have alot of god info to answer you question.
02-20-2005, 03:55 PM
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Glad to hear that you liked them. I have quite a bit of footage that I'd like to process, but it all comes down to time...
The exhaust is based on a 2.5" sport system which was a little too noisy to get approved for street use. We removed the rear silencer and replaced it with a smaller one. We also have a 4-1 exhaust header. We are just below 100dB at the moment, which is where we have to be to get approved for the most strict tracks.
Also, the lack of any silencing component inside the car makes the recorded sound somewhat more ripping that it actually is, but I enjoy the sound of the car indeed!
The exhaust is based on a 2.5" sport system which was a little too noisy to get approved for street use. We removed the rear silencer and replaced it with a smaller one. We also have a 4-1 exhaust header. We are just below 100dB at the moment, which is where we have to be to get approved for the most strict tracks.
Also, the lack of any silencing component inside the car makes the recorded sound somewhat more ripping that it actually is, but I enjoy the sound of the car indeed!
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02-28-2005, 07:33 AM
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Hey Ron!
I thought Zandvoort was 100dB, but I'll take your word for it. During the Porsche Days last year, our car was far from the loudest at the track.... I assume that the 962 had an exception from the requirements?
Anyway, as long as we can plan up ahead - it's not a problem for us. Our silencers are bolted and not welded, so we can mix and match as long as we remember to bring the suitable silencer modules with us.
Cheers,
Ørjan
I thought Zandvoort was 100dB, but I'll take your word for it. During the Porsche Days last year, our car was far from the loudest at the track.... I assume that the 962 had an exception from the requirements?
Anyway, as long as we can plan up ahead - it's not a problem for us. Our silencers are bolted and not welded, so we can mix and match as long as we remember to bring the suitable silencer modules with us.
Cheers,
Ørjan
03-09-2005, 07:52 PM
#9
About the RPM range - I use the car between 5000 and redline on the track. It depends on your exhaust, but Jon Milledge, a respected car builder here in US, told me horsepower horsepower, horsepower. keep the exhaust as open as possible, and keep the revs up. I generate really good power right up to the rev limiter.
I use a stock 88 motor, never been rebuilt, and it runs great. No problems running the revs real high all the time.
timo
I use a stock 88 motor, never been rebuilt, and it runs great. No problems running the revs real high all the time.
timo
03-12-2005, 03:29 PM
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I'll agree with most of what timo944 says, except I'd recommend staying away from the rev. limiter. These engines put out their best power between 4200 and 5600 RPM. After 5600 RPM, the Horsepower and torque go down (unless you've "chipped" the car). Both the spec sheet from Porsche, and dyno tests can attest to those facts. Pushing the car over 6000-rpm tends to rob the oil from #2 rod bearing (either foaming, or flow-loss). Occasional blips to 6000 or 6200 aren't going to hurt the engine. Constant "sitting on", or relying on the rev. limiter will probably wear out your rod bearing(s) prematurely. With 200,000 K. on the engine, have you done a rod-bearing replacement? If not, shift at 5600 to 5800 RPM, and you should be fine for the power band, and save your lower-end a little grief.
As a note, I have 230,000 miles on my '87 engine, which I track monthly, and have only required a rod-bearing replacement.
Just my 2-cents.
As a note, I have 230,000 miles on my '87 engine, which I track monthly, and have only required a rod-bearing replacement.
Just my 2-cents.
